diff --git a/ccl/core/include/ccl/api/RSFormJA.h b/ccl/core/include/ccl/api/RSFormJA.h
index ce5c10f..418f105 100644
--- a/ccl/core/include/ccl/api/RSFormJA.h
+++ b/ccl/core/include/ccl/api/RSFormJA.h
@@ -25,7 +25,7 @@ public:
   [[nodiscard]] std::string ToMinimalJSON() const;
 
   [[nodiscard]] std::string CheckExpression(const std::string& text, rslang::Syntax syntaxHint = rslang::Syntax::UNDEF) const;
-  [[nodiscard]] std::string CheckConstituenta(const std::string& alias, const std::string& definition, semantic::CstType targetType) const;
+  [[nodiscard]] std::string CheckConstituenta(const std::string& alias, const std::string& definition, const std::string& targetType) const;
 
 };
 
diff --git a/ccl/core/src/api/RSFormJA.cpp b/ccl/core/src/api/RSFormJA.cpp
index 2fa5c9d..4f83965 100644
--- a/ccl/core/src/api/RSFormJA.cpp
+++ b/ccl/core/src/api/RSFormJA.cpp
@@ -71,12 +71,11 @@ std::string RSFormJA::ToMinimalJSON() const {
 }
 
 std::string RSFormJA::CheckExpression(const std::string& text, const rslang::Syntax syntaxHint) const {
-  JSON result{};
-
   auto analyser = schema->Core().RSLang().MakeAuditor();
   const auto typeOK = analyser->CheckExpression(text, syntaxHint);
   const auto valueOK = typeOK && analyser->CheckValue();
 
+  JSON result{};
   result["parseResult"] = typeOK;
   result["syntax"] = analyser->GetSyntax();
   result["prefixLen"] = 0;
@@ -111,14 +110,16 @@ std::string RSFormJA::CheckExpression(const std::string& text, const rslang::Syn
 std::string RSFormJA::CheckConstituenta(
   const std::string& alias,
   const std::string& definition,
-  semantic::CstType targetType
+  const std::string& targetType
 ) const {
-  JSON result{};
+  JSON jType = targetType;
+  const auto type = jType.template get<semantic::CstType>();
 
   auto analyser = schema->Core().RSLang().MakeAuditor();
-  const auto typeOK = analyser->CheckConstituenta(alias, definition, targetType);
+  const auto typeOK = analyser->CheckConstituenta(alias, definition, type);
   const auto valueOK = typeOK && analyser->CheckValue();
 
+  JSON result{};
   result["parseResult"] = typeOK;
   result["syntax"] = analyser->GetSyntax();
   result["prefixLen"] = analyser->prefixLen;
diff --git a/ccl/core/test/src/testRSFormJA.cpp b/ccl/core/test/src/testRSFormJA.cpp
index cd7d515..38508ce 100644
--- a/ccl/core/test/src/testRSFormJA.cpp
+++ b/ccl/core/test/src/testRSFormJA.cpp
@@ -135,7 +135,7 @@ TEST_F(UTRSFormJA, CheckExpression) {
 
 TEST_F(UTRSFormJA, CheckConstituenta) {
   auto wrapper = RSFormJA::FromData(SetupSchema());
-  auto reponse = JSON::parse(wrapper.CheckConstituenta("A100", "X1=X1", CstType::axiom));
+  auto reponse = JSON::parse(wrapper.CheckConstituenta("A100", "X1=X1", "axiom"));
   EXPECT_EQ(reponse.at("parseResult").get<bool>(), true);
   EXPECT_EQ(reponse.at("prefixLen"), 7);
   EXPECT_EQ(reponse.at("syntax"), "math");
diff --git a/pyconcept/CHANGELOG.md b/pyconcept/CHANGELOG.md
index 28daf42..9ab1e4d 100644
--- a/pyconcept/CHANGELOG.md
+++ b/pyconcept/CHANGELOG.md
@@ -19,10 +19,16 @@ Here we write upgrading notes. Make them as straightforward as possible.
 
 ### Fixed
 
-## [0.1.7] - 2024-09-22
+## [0.1.8] - 2024-09-22
 
 ### Fixed
 
+- Change check-constituenta to use string representation of CstType
+
+## [0.1.7] - 2024-09-22
+
+### Added
+
 - Improve error messages for invalid types
 - Add API for checking constituenta expressions
 
diff --git a/pyconcept/VERSION b/pyconcept/VERSION
index a1e1395..84aa3a7 100644
--- a/pyconcept/VERSION
+++ b/pyconcept/VERSION
@@ -1 +1 @@
-0.1.7
\ No newline at end of file
+0.1.8
\ No newline at end of file
diff --git a/pyconcept/include/pyconcept.h b/pyconcept/include/pyconcept.h
index 7ad6e0d..8f69390 100644
--- a/pyconcept/include/pyconcept.h
+++ b/pyconcept/include/pyconcept.h
@@ -19,7 +19,7 @@ std::string CheckConstituenta(
   const std::string& jSchema,
   const std::string& alias,
   const std::string& expression,
-  int cstType
+  const std::string& cstType
 );
 
 PYBIND11_MODULE(pyconcept, m) {
diff --git a/pyconcept/src/pyconcept.cpp b/pyconcept/src/pyconcept.cpp
index aa8eede..ca80bd8 100644
--- a/pyconcept/src/pyconcept.cpp
+++ b/pyconcept/src/pyconcept.cpp
@@ -40,8 +40,8 @@ std::string CheckConstituenta(
   const std::string& jSchema,
   const std::string& alias,
   const std::string& expression,
-  int cstType
+  const std::string& cstType
 ) {
 	auto schema = RSFormJA::FromJSON(jSchema);
-	return schema.CheckConstituenta(alias, expression, static_cast<ccl::semantic::CstType>(cstType));
+	return schema.CheckConstituenta(alias, expression, cstType);
 }
\ No newline at end of file
diff --git a/pyconcept/tests/testBinding.py b/pyconcept/tests/testBinding.py
index 483b1b5..f4fd529 100644
--- a/pyconcept/tests/testBinding.py
+++ b/pyconcept/tests/testBinding.py
@@ -59,12 +59,15 @@ class TestBinding(unittest.TestCase):
     def test_check_constituenta(self):
         ''' Test checking expression against given schema '''
         schema = self._get_default_schema()
-        out1 = json.loads(pc.check_constituenta(schema, 'A100', 'X1=X1', 5))
+        out1 = json.loads(pc.check_constituenta(schema, 'A100', 'X1=X1', 'axiom'))
         self.assertEqual(out1['parseResult'], True)
 
-        out2 = json.loads(pc.check_constituenta(schema, 'A100', 'X1=X2', 5))
+        out2 = json.loads(pc.check_constituenta(schema, 'A100', 'X1=X2', 'axiom'))
         self.assertEqual(out2['parseResult'], False)
 
+        out3 = json.loads(pc.check_constituenta(schema, 'D100', 'X1=X1', 'term'))
+        self.assertEqual(out3['parseResult'], False)
+
     def test_reset_aliases(self):
         ''' Test reset aliases in schema '''
         schema = self._get_default_schema()